Boring bar



J. WANELIK Feb. 20, 1945.

BORING BAR Filed July 24, 1943 INVENTOR, John, Wawelik,

ATTORNEY.

Patented Feb 20, 1945 BORING BAR John Wanelik, Clifton, N. J., assignor to M. J. Maguth & Son Machine Works, Garlstadt,

N. J... a firm Application July 24, 1943, Serial No. 495,973

1 Claim.

was held against displacement by a set-screw tapped into the shank. Adjustment, inorder to develop the hole to some predetermined diameter was possible only by retracting the set-screw to release the tool proper. In eflfecting fine adjustments the screw is retracted sufficiently to obtain but a sliding contact with the tool proper,

which is then tapped lightlyin the effort to set longitudinal axis to receive the tool proper, which pact form, without inconvenient and annoying projections and which, though it comprises a plurality of parts, shall be exceedingly simple in construction and well adapted to assume the strains, stresses and shocks incident to its use.

In the drawing:

Figs. 1, and 2 are side elevations of the tool as viewed lengthwise and laterally of the pivot, the bore-including portion of one member (here the shank) appearing in section;

Figs. 3 and 4 are similar elevations of said members viewed the same as in Fig. 2; and

Fig. 5 is an enlarged fragment of the tool as shown in Fig. 1 and showing the arcuate form at I5 of the projections l I.

The tool-holding member comprises'a bar portion 1 and a somewhat enlarged cylindrical portion or butt 2, the bar portion having the usual biased hole 3 to receive the tool 4, which is held fast by'the set-screw 5. The butt 2 has a rearward flat centered projection 8 which terminatesin a reduced tapered stud 1 coaxial with the bar jection 8 of the tool-holding membeniand the head is also formed with a recess [2, here in the form of a cylindrical-bore of at least as great diameter as the base of the stud I. With their common axis parallel with and in a plane midway between the planes of the inner faces of projections I I a pair of opposed set-screws l3 are tapped into the head.

When the projection 6 of the tool-holding member has been entered between the projections ll of the shank member as shown in Fig. 2 its stud 1 extends between set-screws It, with its faces 8a presented thereto. As shown, the two members are in coaxial relation to each other, or alined.

The twomembers are pivoted together by a screw l4 having a hexagonal head Ma and which penetrates all three projections, its axis being perpendicular to the axis of the shank member. The screw is preferably tapped into one of the projections H but has a smooth or unthreaded fit with projection 6 and the other projection ll whereby, having its head Ma preferably countersunk in a recess Ha of the latter projection, it

' serves to clamp all three projections together.

The free or forward ends of the projections H, which terminate in a plane perpendicular to the common axis of said members, abut the rear face of the butt 2 of the tool-holding member and, as shown in Fig. 5, are formed atl5 actually arcuate around the axis of screw l4 so that the latter is relieved of the thrust-strain that would otherwise be imposed thereon in any of various angular positions of the tool holding member.

Of course, to eifect angular adjustment of the tool-holding member, the pivot screw being turned back so as to cease to clamp, one of the setscrews I3 is unscrewed to the required extent and the other screwed in until the tongue is clamped by the set-screws.

It is noted that the parts intervening'between the bar portions 1 and 9 form a plain cylindrical body without projections or enlargements within itself which would involve danger'in handling the implement when it is in operation.

Having thus fully described my invention what I claim is: I

A boring implement including a shank member around whose longitudinal axis the implement is rotated, a tool-holding member coaxial with the shank member, one of the adjacent portions of said members having, extending away from the other such portion, an axial bore and, extending toward said other portion and on opposite sides of the bore, a pair of fork-forming projections and said other portion having a projection extending between the projections of said pair and into and free to undergo angular displacement in the bore, each two adjoining projections having planiforrn adjoining faces parallel with said axis and contacting each other, means to clamp all three projectionstogether includinga pivotformingv screw penetrating saidifaces and having? its axis perpendicular to the first-named axis, 10 

